Synthesis of nearly spherical AlN particles by an in-situ nitriding combustion route  

作　　者：Zhilei Wei Kang Li Bangzhi Ge Chaowei Guo Hongyan Xia Yajie Guo Zhongqi Shi 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an,710049,China [2]Engineering Research Center of Transportation Materials of Ministry of Education,School of Materials Science and Engineering,Chang’an University,Xi’an,710064,China

出　　处：《Journal of Advanced Ceramics》2021年第2期291-300,共10页先进陶瓷（英文）

基　　金：supported by the National Natural Science Foundation of China (Nos. 51872222 and 51002115);the Shaanxi Innovation Capacity Support Program (2018TD-031);the State Key Laboratory for Mechanical Behavior of Materials (20202208)。

摘　　要：Spherical AlN powders with micrometer size have attracted great attention owing to their good fluidity and dispersity. However, the industrial preparation methods usually require high temperature and long soaking time, which lead to the high cost and limit the wide application of the products. Herein, nearly spherical AlN particles with the average size of 2.5 μm were successfully synthesized via an in-situ combustion synthesis method. The effect of N_(2) pressure, NH_(4)Cl content, and Al particle size on the combustion reaction procedure, phase composition, and microstructure of the products was systematically investigated. The results showed that the decreased N_(2) pressure, increased NH_(4)Cl content, and Al particle size led to the decreasing of combustion temperature and speed, which further affected the morphology of the products. As a result, low N_(2) pressure(0.2 MPa), a small amount of NH4Cl(0.5 wt%), and fine Al particles(~2.5 μm) contributed to a moderate combustion temperature and facilitated the formation of nearly spherical AlN particles. In addition, based on the gas-releasing assisted quenching experiments and thermo-kinetic analysis, a two-step growth mechanism for the nearly spherical AlN particles was rationally proposed. The present method shows the advantages of low cost and high efficiency for preparing nearly spherical AlN particles, which can be used as raw materials for electronic substrates and fillers for packaging materials.

关 键 词：combustion synthesis ALN microstructure growth mechanism 

分 类 号：TQ133.1[化学工程—无机化工]